 /*******************************************************************************
  * Copyright (c) 2000, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.internal;

 import org.eclipse.core.runtime.IAdaptable;
 import org.eclipse.ui.IElementFactory;
 import org.eclipse.ui.IMemento;

 /**
  * A WorkingSetFactory is used to recreate a persisted WorkingSet
  * object.
  */
 public class WorkingSetFactory implements IElementFactory {

     /* (non-Javadoc)
      * @see org.eclipse.ui.IElementFactory
      */
     public IAdaptable createElement(IMemento memento) {
         String workingSetName = memento.getString(IWorkbenchConstants.TAG_NAME);
         String label = memento.getString(IWorkbenchConstants.TAG_LABEL);
         if (label == null) {
             label = workingSetName;
         }
         String workingSetEditPageId = memento
                 .getString(IWorkbenchConstants.TAG_EDIT_PAGE_ID);
         String aggregateString = memento
                 .getString(AbstractWorkingSet.TAG_AGGREGATE);
         boolean isAggregate = aggregateString != null
                 && Boolean.valueOf(aggregateString).booleanValue();

         if (workingSetName == null) {
             return null;
         }

         AbstractWorkingSet workingSet = null;
         
         if (isAggregate) {
             workingSet = new AggregateWorkingSet(workingSetName, label, memento);
         } else {
             workingSet = new WorkingSet(workingSetName, label, memento);
         }
         
         if (workingSetEditPageId != null) {
             workingSet.setId(workingSetEditPageId);
         } else if (!isAggregate) {
             // working sets created with builds 20020418 and 20020419 will not
 // have an edit page id. fix this automatically.
 workingSet.setId("org.eclipse.ui.resourceWorkingSetPage"); //$NON-NLS-1$
 }
         return workingSet;
     }
 }

